add new configuration parameter to grizzly.properties

# The maximum header size for an HTTP request in bytes. Make sure to increase
# this value for all components of your infrastructure when you are forced to
# deal with enormous headers. For Apache as our default balancer see
# http://httpd.apache.org/docs/current/mod/core.html#limitrequestfieldsize
# Default value: 8192
com.openexchange.http.grizzly.maxHttpHeaderSize=81 92